Which are the causes of Lymphoedema?

TL;DR: Lymphoedema is caused by the impairment of the lymphatic system, which prevents lymph fluid from draining properly and leads to chronic swelling. It is categorized into primary lymphoedema, caused by genetic factors, and secondary lymphoedema, which results from damage to the lymphatic system due to surgery, trauma, or infection.

What causes primary versus secondary lymphoedema?

The causes of lymphoedema are divided into two distinct categories. Primary lymphoedema is the result of congenital abnormalities in the development of lymph vessels, often present at birth or appearing during puberty. Secondary lymphoedema is far more common globally and occurs when an otherwise healthy lymphatic system is damaged or blocked by external forces, such as cancer treatments or injury.

What are the genetic and environmental risk factors?

While secondary lymphoedema is acquired, primary lymphoedema often involves specific genetic mutations. Research indicates that mutations in genes like FLT4 (which encodes the VEGFR-3 receptor) are responsible for Milroy disease, a hereditary form of lymphoedema. Environmental triggers for secondary cases include:

• Surgical intervention: Removal of lymph nodes during cancer surgery (e.g., breast cancer procedures).


• Radiation therapy: Scarring of lymphatic vessels following cancer treatment.


• Infections: Lymphatic filariasis, a parasitic infection caused by mosquito-borne worms, is a leading cause of lymphoedema in tropical regions.


• Chronic inflammation: Persistent injury or untreated venous insufficiency.

Is the etiology of lymphoedema fully understood?

While we understand the basic mechanism—a failure of the "drainage" system—the exact molecular pathways triggering the progression from mild swelling to permanent tissue fibrosis are still under active investigation. Researchers are currently focusing on how lymphatic endothelial cells communicate with the immune system and how chronic inflammation exacerbates the condition.

Next steps

• Consult a vascular specialist or a certified lymphedema therapist to develop a management plan.


• Join our community at DiseaseMaps.org to connect with 86 members sharing their experiences with lymphoedema.


• Monitor your limbs for early signs of swelling and avoid constrictive clothing or skin injuries in affected areas.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Lymphoedema


• Orphanet: Primary lymphedema


• National Cancer Institute (NCI): Lymphedema (PDQ)


• Lymphatic Education & Research Network (LE&RN)